Re: [css-ruby] Add "text-orientation: upright" for bopomofo annotation

On Wed, Aug 26, 2015 at 12:15 AM, fantasai
<fantasai.lists@inkedblade.net> wrote:
> On 08/25/2015 02:59 PM, Xidorn Quan wrote:
>> I propose that we should add "text-orientation: upright" to the
>> "rt:lang(zh-TW)" rule.
>>
>> The reason is that, all the tone marks in bopomofo (U+02CA, U+02C7,
>> U+02CB, U+02D9) have Vertical_Orientation property "R" while the
>> bopomofo characters are all "U". It means, without explicitly setting
>> text-orientation to upright, the text run would break between them,
>> which makes it impossible to use font feature to place the tone mark
>> properly.
>
> I think it would make more sense to have Unicode update UTR50 to make
> these characters upright in mixed-orientation text (or otherwise tailor
> it within CSS as a whole). It's not just a problem with ruby.

Well, that could be tricky, because those characters might also be
used with latin scripts. I'm not sure anyway.

Koji, any thoughts?

- Xidorn